HELP! 2012 BOSS Rattle

I have only had this car for a few weeks now and have experienced very few issues. Today, I get in my car to drive to work and start hearing this rattle noise. Its definitely coming from under me but not sure where.

Could this be a transmission issue? Missed a shift the other day but the car has been driving multiple times since then and no rattle until now. What could be causing this annoying noise?

Also, do you guys get brake squeal from your Brembos? Heard it's normal but wanted your input as well.

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